The use of springs is very wide, and it can play a decisive role in every industry. It is conceivable that the market demand for springs is also very large. Every spring manufacturer will have a production standard for springs when producing springs, so as to ensure the quality of springs and provide customers with excellent products. Speaking of production standards, what are the manufacturers’ production standards for springs?
It is mainly described according to its diameter, length, and number of turns. You can learn about it before using it.
1.Spring wire diameter d.
2.Spring outer diameter D2.
3.Spring inner diameter D1.
4.The average middle diameter of the hardward spring, its calculation formula is:D=(D+D1)÷2=D1+d=D-d
5.In addition to the supporting turn, the axial distance between the corresponding points of two adjacent turns of the spring on the middle diameter becomes the pitch, which is represented by t.
6.Effective number of turns n: the number of turns that the spring can maintain the same pitch.
7.Number of supporting turns n2: In order to make the spring evenly stressed during work and ensure that the axis is perpendicular to the end face, the two ends of the spring are usually tightened together during manufacture. The tight turns only play a supporting role and are called support turns. Generally, there are 1.5T, 2T, 1.5T, and 2T is commonly used.
8.Total number of turns n1: the sum of effective turns and support turns. n1=n+n2.
9.Free height H0: the height of the spring without external force, H0=nt+(n2-0.5)d=nt+1.5d (n2=2)
10.The length of the metal spring unfolded: the length of the steel wire required for winding the spring. L≈n1 (ЛD2)2+n2 (pressure spring) L=ЛD2 n+hook extension length (extension spring).
11.Spiral direction: There is a distinction between left and right rotation. Right rotation is often used. If it is not indicated on the drawing, right and left are generally used.